| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.79 | 111 |
| 2015 | 1.13 | 134 |
| 2014 | 7.2 | 103 |
| 2013 | 3.21 | 137 |
| 2012 | 20.83 | 22 |
| 2011 | 0.79 | 146 |
| 2010 | 1.02 | 149 |
| 2009 | 17.25 | 48 |
| 2008 | 16.44 | 69 |
| 2007 | 11.61 | 124 |
| 2006 | 19.73 | 74 |
| 2005 | 35.45 | 17 |
| 2004 | 15.2 | 71 |
| 2003 | -.72 | 150 |
| 2002 | 5.67 | 118 |
| 2001 | 6.94 | 119 |
| 2000 | 11.69 | 91 |
| 1999 | 4.23 | 136 |
| 1998 | 14.49 | 59 |
| 1997 | 11.33 | 95 |
| 1996 | 23.19 | 49 |
| 1995 | 3.96 | 133 |
| 1994 | 16.66 | 82 |
| 1993 | 15.25 | 76 |
| 1992 | -6.91 | 129 |
| 1991 | 2.53 | 110 |
| 1990 | 6.24 | 95 |
| 1989 | 6.37 | 102 |
| 1988 | 0.61 | 114 |
| 1987 | 3.47 | 105 |
| 1986 | -2.73 | 116 |